Clofibric acid degradation in UV254/H2O2 process: Effect of temperature

Li, Wenzhen; Qiu, Zhaofu; Lin, Kuangfei

doi:10.1016/j.jhazmat.2009.11.147

Cited by 35 publications

(11 citation statements)

References 40 publications

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“…However, the second-order rate constant of

with CA was not obtained from the literature. Similar suppression effect of

on CA degradation was observed in UV/H 2 O 2 process, which was explained by lower rate constant of CA with

than with HO• [ 31 ].

The effect of HA on CA degradation in UV/chlorine process is shown in figure 8 .…”

Section: Resultssupporting

confidence: 59%

See 1 more Smart Citation

Degradation of clofibric acid in UV/chlorine disinfection process: kinetics, reactive species contribution and pathways

Tang¹,

Shi²,

Liu³

et al. 2018

R. Soc. open sci.

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As a potential endocrine disruptor, clofibric acid (CA) was investigated in this study for its degradation kinetics and pathways in UV/chlorine process. The results showed that CA in both UV photolysis and UV/chlorine processes could be degraded via pseudo-first-order kinetics, while it almost could not be degraded in the dark chlorination process. The observed rate constant (kobs) in UV photolysis was 0.0078 min−1, and increased to 0.0107 min−1 combining with 0.1 mM chlorine. The kobs increased to 0.0447 min−1 with further increasing the chlorine dosage from 0.1 to 1.0 mM, and reached a plateau at higher dosage (greater than 1.0 mM). The higher kobs was obtained at acid solution rather than basic solution. Moreover, the calculated contributions of radical species to kobs indicated that the HO• contributed significantly to CA degradation in acidic conditions, while the reactive chlorine species and UV direct photolysis dominated in neutral and basic solution. The degradation of CA was slightly inhibited in the presence of HCO3− (1 ∼ 50 mM), barely affected by the presence of Cl− (1 ∼ 200 mM) and greatly suppressed by humic acid (0 ∼ 5 mg l−1). Thirteen main degradation intermediates and three degradation pathways of CA were identified during UV/chlorine process.

show abstract

“…However, the second-order rate constant of

with CA was not obtained from the literature. Similar suppression effect of

on CA degradation was observed in UV/H 2 O 2 process, which was explained by lower rate constant of CA with

than with HO• [ 31 ].

The effect of HA on CA degradation in UV/chlorine process is shown in figure 8 .…”

Section: Resultssupporting

confidence: 59%

“…On the other hand, HA reacts with HO• and Cl• with secondorder rate constants of 2.5 × 10 4 (mg l −1 ) −1 s −1 and 1.3 × 10 4 (mg l −1 ) −1 s −1[29], respectively, thus acting as radical scavengers[33]. Li et al[31] reported a similar inhibition effect of HA on CA degradation in UV/H 2 O 2 process.…”

mentioning

confidence: 92%

Degradation of clofibric acid in UV/chlorine disinfection process: kinetics, reactive species contribution and pathways

Tang¹,

Shi²,

Liu³

et al. 2018

R. Soc. open sci.

View full text Add to dashboard Cite

show abstract

“…Among the six selected pharmaceuticals, clofibric acid has attracted widespread attention because it was difficult to be degraded by traditional biological treatments and can persist in the aquatic environment. For example, it has been found that the removal rate of clofibric acid by traditional WWTP was only 55%, while the half-life of photolytic clofibric acid in the natural environment can be as long as 250 days in winter (Li et al, 2010). Thus, clofibric acid was selected as an example, and its transformation pathway in the 20-L BEF process was investigated by using the HPLC-MS/MS under MS2 scan.…”

Section: The Pharmaceuticals Transformation Pathway In Bef Systemmentioning

confidence: 99%

Degradation of pharmaceuticals from wastewater in a 20-L continuous flow bio-electro-Fenton (BEF) system

Zou

Angelidaki

Yang

et al. 2020

Science of The Total Environment

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“…On the one hand, nitrate ion can form •OH radicals under UV irradiation [29]. The •OH radicals can promote DCF degradation.…”

Section: Effect Of Nitrate Ion On the Photodegradation Of Dcfmentioning

confidence: 99%

Diclofenac photodegradation under simulated sunlight: Effect of different forms of nitrogen and Kinetics

Zhang¹,

Liu²,

Liu³

et al. 2011

Journal of Hazardous Materials

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Clofibric acid degradation in UV254/H2O2 process: Effect of temperature

Cited by 35 publications

References 40 publications

Degradation of clofibric acid in UV/chlorine disinfection process: kinetics, reactive species contribution and pathways

Degradation of clofibric acid in UV/chlorine disinfection process: kinetics, reactive species contribution and pathways

Degradation of pharmaceuticals from wastewater in a 20-L continuous flow bio-electro-Fenton (BEF) system

Diclofenac photodegradation under simulated sunlight: Effect of different forms of nitrogen and Kinetics

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